Luhn mod 10 how to do it

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LUHN formula (modulus 10)

1. Beginning with the second digit from the end (on the right), take every other digit and multiply it by two.

2. Proceeding right to left, take each of the digits skipped in step 1 and add them to the result digits from step 1.

3. Subtract the result obtained in step 2 from the next higher number that ends in 0.

I hope it's helpful

3=log(n)=2

answer a: product property